154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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* Sky Nexus Register Driver
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*
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* Copyright (C) 2002 Brian Waite
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*
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* This driver allows reading the Nexus register
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* It exports the /proc/sky_chassis_id and also
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* /proc/sky_slot_id pseudo-file for status information.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/proc_fs.h>
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#include <linux/hdpu_features.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <asm/io.h>
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static int hdpu_nexus_probe(struct platform_device *pdev);
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static int hdpu_nexus_remove(struct platform_device *pdev);
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static int hdpu_slot_id_open(struct inode *inode, struct file *file);
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static int hdpu_slot_id_read(struct seq_file *seq, void *offset);
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static int hdpu_chassis_id_open(struct inode *inode, struct file *file);
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static int hdpu_chassis_id_read(struct seq_file *seq, void *offset);
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static struct proc_dir_entry *hdpu_slot_id;
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static struct proc_dir_entry *hdpu_chassis_id;
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static int slot_id = -1;
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static int chassis_id = -1;
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static const struct file_operations proc_slot_id = {
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.open = hdpu_slot_id_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static const struct file_operations proc_chassis_id = {
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.open = hdpu_chassis_id_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.owner = THIS_MODULE,
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};
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static struct platform_driver hdpu_nexus_driver = {
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.probe = hdpu_nexus_probe,
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.remove = hdpu_nexus_remove,
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.driver = {
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.name = HDPU_NEXUS_NAME,
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},
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};
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static int hdpu_slot_id_open(struct inode *inode, struct file *file)
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{
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return single_open(file, hdpu_slot_id_read, NULL);
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}
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static int hdpu_slot_id_read(struct seq_file *seq, void *offset)
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{
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seq_printf(seq, "%d\n", slot_id);
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return 0;
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}
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static int hdpu_chassis_id_open(struct inode *inode, struct file *file)
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{
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return single_open(file, hdpu_chassis_id_read, NULL);
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}
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static int hdpu_chassis_id_read(struct seq_file *seq, void *offset)
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{
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seq_printf(seq, "%d\n", chassis_id);
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return 0;
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}
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static int hdpu_nexus_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int *nexus_id_addr;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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printk(KERN_ERR "sky_nexus: "
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"Invalid memory resource.\n");
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return -EINVAL;
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}
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nexus_id_addr = ioremap(res->start,
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(unsigned long)(res->end - res->start));
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if (nexus_id_addr) {
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slot_id = (*nexus_id_addr >> 8) & 0x1f;
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chassis_id = *nexus_id_addr & 0xff;
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iounmap(nexus_id_addr);
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} else {
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printk(KERN_ERR "sky_nexus: Could not map slot id\n");
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}
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hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
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if (!hdpu_slot_id) {
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printk(KERN_WARNING "sky_nexus: "
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"Unable to create proc dir entry: sky_slot_id\n");
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} else {
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hdpu_slot_id->proc_fops = &proc_slot_id;
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hdpu_slot_id->owner = THIS_MODULE;
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}
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hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
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if (!hdpu_chassis_id) {
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printk(KERN_WARNING "sky_nexus: "
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"Unable to create proc dir entry: sky_chassis_id\n");
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} else {
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hdpu_chassis_id->proc_fops = &proc_chassis_id;
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hdpu_chassis_id->owner = THIS_MODULE;
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}
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return 0;
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}
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static int hdpu_nexus_remove(struct platform_device *pdev)
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{
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slot_id = -1;
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chassis_id = -1;
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remove_proc_entry("sky_slot_id", &proc_root);
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remove_proc_entry("sky_chassis_id", &proc_root);
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hdpu_slot_id = 0;
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hdpu_chassis_id = 0;
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return 0;
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}
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static int __init nexus_init(void)
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{
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return platform_driver_register(&hdpu_nexus_driver);
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}
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static void __exit nexus_exit(void)
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{
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platform_driver_unregister(&hdpu_nexus_driver);
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}
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module_init(nexus_init);
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module_exit(nexus_exit);
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MODULE_AUTHOR("Brian Waite");
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MODULE_LICENSE("GPL");
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